* LARDNER, REV. DIONYSIUS, LLD., was born April 3rd, 1793, in the city of Dublin, where his father was a solicitor. At the age of fourteen he was placed in his father's office, but having taken a dislike to the profession, in 1812 he was entered of Trinity College, Dublin, where he took his degree of B.A. in 1817, having previously obtained several prizes in logic, mathematics, natural philosophy, astronomy, and moral philosophy. He continued to reside in the University as a member till 1827, and in the meantime published a Treatise on Algebraic Geometry,' 8vo, 1823 ; a Treatise on Trigono metry; a Treatise on Differential and Integral Calculus,' 8vo, 1825; and a Treatise on Solid Geometry,' besides several articles on mathe matical subjects which he contributed to the Edinburgh Encyclopacclia' and the 'Eocyclopmdia Metropolitans.' He afterwards delivered a course of lectures before the Royal Dublin Society, for which, in addi tion to the usual remuneration, he was presented with a gold medal. These lectures he published in 1828, 'Popular Lectures on the Steam• Engine,' 8vo, a work which has been improved and extended in several subsequent editions. In the year 1828, when the London University, now University College, was established, Mr. Lardner was appointed professor of natural philosophy and astronomy, and in the same year published 'A Discourse on the Advantages of Natural Philosophy,' 8vo, and 'An Analytical Treatise on Plane and Spherical Trigono metry,' 8vo. In 1830 he commenced the Cabinet Library,' 9 vole. 12mo, 1830.32, and in the same year projected and commenced an extensive series of works by writers of the highest class, well-known as Lardner'e Cabinet Cyclopmdia; 134 vole. 12mo, 1830-44. For this
series Dr. Lardner furnished Hydrostatics and Pneumatics,' Mecha nics' with Captain Kater, a 'Treatise on Heat," Treatise on Arithmetic, ' Treatise on Geometry,' and Lardner and Walker's Electricity,' 2 vole. For the 'Library of Useful KnOwledge ' he wrote several treatises on different branches of natural philosophy. Between the years 1830 and 1840 he was also an occasional contributor to the 'Edinburgh Review' and other periodical works. In 1840 circumstances of a private nature occasioned Dr. Lardner to go to Paris, and afterwards to North America, where he delivered lectures in most of the cities and towns of the United States. The lectures were afterwards published in two large volumes, which have been there frequently reprinted. Dr. Lardner returned to Europe in 1845, and settled in Paris, where he still continues to reside. He has since published a Handbook of Natural Philosophy and Astronomy,' 2 vols. 12mo, 1851.52, and The Great Exhibition reviewed,' 12mo, 1852. In 1854 he commenced the publication of The Museum of Science and Art,' a series of essays on the physical sciences and their applications to the industrial arts. This series is now complete in 12 vols. 12mo. In 1854, 1855, and 1856 he published in 8vo Handbooks' of 'Natural Philosophy and Hydrostatics,' of 'Pneumatics and Heat,' of 'Natural Philosophy and Mechanics,' of Natural Philosophy, Electricity, Magnetism, and Acoustics,' and of 'Natural Philosophy and Optics.'